Uh-huh. So if Ka-Zar fighting Thanos is included in Ka-Zar fighting real Thanos TPB, it unretcons Starlin doing so?

It indeed would unretcon Starlin's doing so, but of course Marvel wouldn't do such a thing because pretty much everyone agrees that story is terrible and should have been retconned. Sometimes there are good retcons.

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Darkseid getting hit by his own omegas is hardly a fair fight. Superman himself said if omegas hits him, he is done for.

Of course it's a fair fight. In the Avengers movie, Iron Man absorbs Thor's lightning to amp himself to 400% thus using Thor's own power against him. Is that somehow unfair? Similarly, if Superman can use his speed and evade Darkseid's attack and then reflect it back on Darkseid, that's perfectly fair. That this keeps happening to Darkseid in fight after fight practically indicates that Darkseid's omegas aren't all that effective. As for how damaging they can be, they are all over the place. Sometimes they do nothing to Superman or Power Girl, here taking two shots, punching one of them away.